Artifact-like effect problem

Hi people, I’ve stacked a bunch of floor meshes to construct the structure below but it appears abnormal when moving/viewed from a certain angle.
Could anyone please tell me what causes this and how can I fix it ?

Why did you stack a bunch of floor meshes rather than scaling one or a few to create that? My guess is the engine is trying to shadow each floor mesh indepently from the others, but is gettinga slightly different result for some reason and generating those curved bands on the whole structure?

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